I have a shapefile with over 100k polygons (some of them have holes in them but apart from that they are simple polygons - no multipart). I want to loop through all of these polygons and select only ...

I have some polygon layers (parcels) that have vertexes drawn around curves, as if traced.
How do I click and drag to draw vertexes in a smooth shape? Big difference between what was originally there, ...

How to find the the boundary co-ordinates from a given set of co-ordiantes?
I understand that this question asked previously and answered here
How to find the boundary co-ordinates from a given set ...

Using QGIS (by now I have the 2.4 version) I would like to set some parameter (I don't know if such exists) that would impose a definite or maximal distance between nodes when digitizing a polyline or ...

I want to activate the option "Show markers only for selected features" in Setting-> options->vertex markers ,using python.
does anyone know if i can do it programmatically ?
i attached a photo of the ...

Paolo
I've got many rivers (polylines ZM) with a lot of height errors in Polylines 'vertices.
Vertices' Z errors are not all equal in height (i.e. they are not all at zero height).
I must create a TIN ...

I have a set of polygons drawn using an inaccurate GPS PDA. these polygons are sharing nodes.
after post-processing GPS data to get accurate coordinates i have a set of all the nodes, then i have to ...